NDLI: PhaC and PhaR Are Required for Polyhydroxyalkanoic Acid Synthase Activity in Bacillus megaterium

Content Provider	PubMed Central
Author	Mccool, Gabriel J. Cannon, Maura C.
Copyright Year	2001
Abstract	Polyhydroxyalkanoic acids (PHAs) are a class of polyesters stored in inclusion bodies and found in many bacteria and in some archaea. The terminal step in the synthesis of PHA is catalyzed by PHA synthase. Genes encoding this enzyme have been cloned, and the primary sequence of the protein, PhaC, is deduced from the nucleotide sequences of more than 30 organisms. PHA synthases are grouped into three classes based on substrate range, molecular mass, and whether or not there is a requirement for phaE in addition to the phaC gene product. Here we report the results of an analysis of a PHA synthase that does not fit any of the described classes. This novel PHA synthase from Bacillus megaterium required PhaC (PhaCBm) and PhaR (PhaRBm) for activity in vivo and in vitro. PhaCBm showed greatest similarity to the PhaCs of class III in both size and sequence. Unlike those in class III, the 40-kDa PhaE was not required, and furthermore, the 22-kDa PhaRBm had no obvious homology to PhaE. Previously we showed that PhaCBm, and here we show that PhaRBm, is localized to inclusion bodies in living cells. We show that two forms of PHA synthase exist, an active form in PHA-accumulating cells and an inactive form in nonaccumulating cells. PhaC was constitutively produced in both cell types but was more susceptible to protease degradation in the latter type. Our data show that the role of PhaR is posttranscriptional and that it functions directly or indirectly with PhaCBm to produce an active PHA synthase.
Related Links	http://dx.doi.org/10.1128/jb.183.14.4235-4243.2001
Ending Page	4243
Page Count	9
Starting Page	4235
File Format	PDF
ISSN	00219193
e-ISSN	10985530
Journal	Journal of Bacteriology
Issue Number	14
Volume Number	183
Language	English
Publisher	American Society for Microbiology
Publisher Date	2001-07-15
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Molecular Biology Microbiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Microbiology

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